Malicious PDF — malware analysis report

Static analysis result for SHA-256 7056c7bca4e1ba4f…

MALICIOUS

PDF

43.1 KB Created: 2020-08-06 15:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83443d1c26c282a1a2ff390311455c07 SHA-1: 3767c1ba0173cc9c53d62a8fc63a16bf5eda97b8 SHA-256: 7056c7bca4e1ba4f8696fa671b5f7e7b3b7a4fcb7fd20fb0a131f9dbcf802ff8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, including one pointing to the malicious redirector ttraff.cc, which is disguised as a Kaufland leaflet. The document also features a large number of links to external PDF files, many hosted on Shopify, likely as part of a link farm to improve search engine ranking for malicious content. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=kaufland+let%25C3%25A1k+v+pdf
    • http://files.oneburgh.com/uploads/1/3/2/7/132740723/f43c72ddc39.pdf
    • http://files.blainevdg.com/uploads/1/3/2/7/132740665/fulajusomatamaxopiwe.pdf
    • http://files.stpetersharbourlighthouse.com/uploads/1/3/1/4/131453574/4647872.pdf
    • http://files.quickdrawcustomgraphics.com/uploads/1/3/2/6/132681985/sovos_toxodamibajijuj_deketefufiduke_doxozijiji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/grade_7_math_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/1806/7876/files/vebafusiwowuzovajuvixo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3024/files/sosetozabaki.pdf
    • https://cdn.shopify.com/s/files/1/0432/1997/6350/files/xufajeneli.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3880/files/xusogidi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lorabo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4392/8726/files/archenemies_marissa_meyer_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1994/3579/files/82336010218.pdf
    • https://cdn.shopify.com/s/files/1/0440/8567/4149/files/petrografi_batuan_sedimen_klastik.pdf
    • https://cdn.shopify.com/s/files/1/0432/0532/9064/files/65408850548.pdf
    • https://cdn.shopify.com/s/files/1/0436/1905/7822/files/binofepisox.pdf
    • https://cdn.shopify.com/s/files/1/0433/9246/7109/files/6081861998.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/pharmacotherapy_casebook_10th_edition_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000686a.bin
cb1e816ac651442c6adb6222709cfda056e5290748fb448cc529045e0b806895		 pdf-font-stream PDF embedded font (sfnt) at offset 0x686A 5088 bytes
font_01_sfnt_off0000794e.bin
4f1de01f936ea1ee5b083fde8b06820bb1c4e37df2c0b4fbdc91aec2f4abdf7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x794E 11864 bytes

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